Slow Cooker Marry Me Chicken

Ingredients

• 4 boneless skinless chicken breasts
• 1 TBSP olive oil
• 1 onion ((finely chopped))
• 3 cloves garlic ((minced))
• ½ cup sundried tomatoes ((chopped))
• 1 cup chicken broth
• ½ cup plain Greek yogurt
• 1 tsp mustard powder
• 1 tsp dried oregano
• 1 tsp dried thyme
• salt ((to taste))
• black pepper ((to taste))
• fresh parsley ((chopped, for garnish))